Tragedy.......A zikite dies after an all night reading

Last week we received an information concerning the death of one of our students studying in Okofia Nnewi; her name is Chisom Donny Osigwe. She was a medical student. According to the information, she died after observing an all night reading on Thursday to  prepare for her quiz on Friday but to the surprise of everybody she did not wake up to go for the  lecture. When her friends got tired of waiting for her to wake, they started to bang on  her door to know whether she will open but she never did. Finally after several knockings and banging on the door, they then broke into her room only to find nothing else but her lifeless darkened and changed body. We were told that her complexion was dark when they saw her in her room lying lifelessly. What could possibly be the cause of this death?. Some persons that we interviewed said that she has other health issues before now which could be the cause of her death. The cause of her death is still a mystery that I would love to solve anytime.